Electrolytic production of hydrogen
Methods for producing hydrogen gas from organic substances. According to the methods, hydrogen is produced from an electrochemical reaction of an organic substance with water or a base. The instant methods permit the production of hydrogen at lower operating voltages or lower operating temperatures relative to water electrolysis. Operable organic substances include alcohols, ethers, carboxylic acids, aldehydes, and ketones. In a preferred embodiment, hydrogen gas is produced from an electrochemical reaction of methanol in the presence of a base such as NaOH or KOH.
1. A method for producing hydrogen gas comprising the steps of:
providing an electrolyte solution, said electrolyte solution including an organic substance and a metal hydroxide base, said organic substance comprising carbon;
placing said electrolyte solution in an electrochemical cell, said electrochemical cell including an anode and a cathode; and
providing a voltage between said anode and said cathode, said voltage inducing an electrochemical reaction in said electrochemical cell,
wherein said electrochemical reaction produces hydrogen gas.
2. The method of claim 1 , wherein said organic substance further comprises oxygen.
3. The method of claim 1 , wherein said organic substance is an alcohol.
4. The method of claim 3 , wherein said alcohol is methanol.
5. The method of claim 3 , wherein said alcohol is ethanol.
6. The method of claim 1 , wherein said organic substance is an aldehyde or a carboxylic acid.
7. The method of claim 1 , wherein said organic substance is a hydrocarbon.
8. The method of claim 1 , wherein said organic substance is an ether or a ketone.
9. The method of claim 1 , wherein said electrolyte solution further includes water.
10. The method of claim 1 , wherein said electrolyte solution further includes a conductivity-enhancing agent.
11. The method of claim 1 , wherein said metal hydroxide base is an alkali or alkaline earth metal hydroxide.
12. The method of claim 1 , wherein the concentration of said metal hydroxide base in said electrolyte solution is at least 1 M.
13. The method of claim 1 , wherein the concentration of said metal hydroxide base in said electrolyte solution is at least 3 M.
14. The method of claim 1 , wherein the concentration of said metal hydroxide base in said electrolyte solution is at least 6 M.
15. The method of claim 1 , wherein the concentration of said metal hydroxide base in said electrolyte solution is at least 9 M.
16. The method of claim 1 , wherein the concentration of said metal hydroxide base in said electrolyte solution is at least 12 M.
17. The method of claim 1 , wherein said electrolyte solution consists essentially of said organic substance and said metal hydroxide base.
18. The method of claim 1 , wherein said anode or said cathode includes a hydrogen storage alloy.
19. The method of claim 1 , wherein the magnitude of said voltage is less than 1.0 V.
20. The method of claim 1 , wherein the magnitude of said voltage is less than 0.5 V.
21. The method of claim 1 , wherein the magnitude of said voltage is less than 0.25 V.
22. The method of claim 1 , wherein said electrochemical cell is heated to a temperature above room temperature.
23. A method for producing hydrogen gas comprising the steps of:
providing an electrolyte solution, said electrolyte solution including an organic substance, said organic substance comprising carbon;
placing said electrolyte solution in an electrochemical cell, said electrochemical cell including an anode and a cathode; and
providing a voltage between said anode and said cathode, said voltage inducing an electrochemical reaction in said electrochemical cell,
wherein said electrochemical reaction produces hydrogen gas and carbonate ion.
24. The method of claim 23 , wherein said electrolyte solution further includes a base.
25. A method for producing hydrogen gas comprising the steps of:
providing an electrolyte solution, said electrolyte solution including an organic substance, said organic substance comprising carbon;
placing said electrolyte solution in an electrochemical cell, said electrochemical cell including an anode and a cathode; and
providing a voltage between said anode and said cathode, said voltage inducing an electrochemical reaction in said electrochemical cell,
wherein said electrochemical reaction produces hydrogen gas and bicarbonate ion.
26. The method of claim 25 , wherein said electrolyte solution further includes a base.
27. A method for producing hydrogen gas comprising the steps of:
providing an electrolyte solution, said electrolyte solution including an organic substance, said organic substance comprising carbon;
placing said electrolyte solution in an electrochemical cell, said electrochemical cell including an anode and a cathode; and
providing a voltage between said anode and said cathode, said voltage inducing an electrochemical reaction in said electrochemical cell,
wherein said electrochemical reaction produces hydrogen gas without producing carbon dioxide.
28. The method of claim 27 , wherein said electrolyte solution further includes a base.
29. The method of claim 27 , wherein said electrolyte solution further includes an acid.
30. The method of claim 27 , wherein said electrolyte solution further includes a conductivity-enhancing agent.